DIN 7980 is the international standard for Spring lock washers with square ends
DIN 7980 is the international standard for Spring lock washers with square ends
Often used in conjunction with cheese head or cylinder head screws. They are often known as micro spring washers. or split washers, or even coil washers The washer has a rectangle section and is split and bent into a helical shape which results in it exerting a spring force between the fastener head and substrate
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| Thread Size | d1 | d2 | s | h | r | |||
| min. | max. | max. | Limit | min. | max. | |||
| M3 | 3.1 | 3.4 | 5.6 | 1 | ±0.1 | 2 | 2.36 | 0.2 |
| M3.5 | 3.6 | 3.9 | 6.1 | 1 | ±0.1 | 2 | 2.36 | 0.2 |
| M4 | 4.1 | 4.4 | 7 | 1.2 | ±0.1 | 2.4 | 2.83 | 0.2 |
| M5 | 5.1 | 5.4 | 8.8 | 1.6 | ±0.1 | 3.2 | 3.78 | 0.2 |
| M6 | 6.1 | 6.5 | 9.9 | 1.6 | ±0.1 | 3.2 | 3.78 | 0.3 |
| M8 | 8.1 | 8.5 | 12.7 | 2 | ±0.1 | 4 | 4.72 | 0.5 |
| M10 | 10.2 | 10.7 | 16 | 2.5 | ±0.15 | 5 | 5.9 | 0.8 |
| M12 | 12.2 | 12.7 | 18 | 2.5 | ±0.15 | 5 | 5.9 | 0.8 |
| M14 | 14.2 | 14.7 | 21.1 | 3 | ±0.2 | 6 | 7.1 | 1 |
| M16 | 16.2 | 17 | 24.4 | 3.5 | ±0.2 | 7 | 8.25 | 1 |
| M18 | 18.2 | 19 | 26.4 | 3.5 | ±0.2 | 7 | 8.25 | 1 |
| M20 | 20.2 | 21.2 | 30.6 | 4.5 | ±0.2 | 9 | 10.6 | 1 |
| M22 | 22.5 | 23.5 | 32.9 | 4.5 | ±0.2 | 9 | 10.6 | 1 |
| M24 | 24.5 | 25.5 | 35.9 | 5 | ±0.2 | 10 | 11.8 | 1.6 |
| M27 | 27.5 | 28.5 | 38.9 | 5 | ±0.2 | 10 | 11.8 | 1.6 |
| M30 | 30.5 | 31.7 | 44.1 | 6 | ±0.2 | 12 | 14.2 | 1.6 |
| M33 | 33.5 | 34.7 | 47.1 | 6 | ±0.2 | 12 | 14.2 | 1.6 |
| M36 | 36.5 | 37.7 | 52.2 | 7 | ±0.25 | 14 | 16.5 | 1.6 |
| M42 | 42.5 | 43.7 | 60.2 | 8 | ±0.25 | 16 | 18.9 | 2 |
| M48 | 49 | 50.5 | 67 | 8 | ±0.25 | 16 | 18.9 | 2 |